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BLOCK LENGTH.字组长度:一个字组中所包含的二进制信息组或字母的总数。BOT(Beginning of tape).始点:磁带的始端。在一条IBM适用的磁带上,用一个反射标志指示该点。此点可作为磁带开始工作的参考。BCD(Binany coded decimal).二进制编码的十进制数制:以2为基础的数制,四个二进制数为一组,表示一个十进制的数值。CRC(Cyclic redundancy check).循环冗余校验:在一些记录的尾端记录的校验符号。计算机用此检测和校正在一个磁轨中出现的差错(只在九轨记录中使用)。
BLOCK LENGTH. Block length: The total number of binary fields or letters contained in a block. BOT (Beginning of tape). Starting point: the beginning of the tape. On an IBM-supplied tape, a reflective mark indicates the point. This point can be used as a reference for the beginning of the tape. BCD (Binar coded decimal). Binary coded decimal system: A 2-based number system with four binary numbers representing a decimal value. CRC (Cyclic redundancy check). Cyclic Redundancy Check: A check symbol recorded at the end of some records. Computers use this to detect and correct errors in one track (only used in nine-track recording).